JDI Launches Ultra-thin Sensor that can Accurately Identify Vital Signs and Pulse Measurement

The reading speed of this sensor is 4.4 times that of previous products, at 19.5 frames per second. This sensor can not only accurately identify vital signs, but also perform biometrics of fingerprints and veins at the same time. It is estimated that it will be used in terminals such as wearable devices to help prevent fraudulent use and confusion for patients. JDI hopes to achieve mass production in 3 years.

Since 2017, JDI has cooperated with the University of Tokyo to jointly develop an optical thin image sensor. This time, JDI has re-examined the driving method of Low-Temperature Poly-Silicon( LTPS) Thin-film Transistors (TFT), reducing the number of scans per frame of the sensor from two to one.

As the reading speed of the sensor is further improved, the pulse can be measured more accurately. Pulse can show changes in the pressure and volume of peripheral blood vessels that reflect the beating of the heart. It is a biological signal that can predict the degree of arteriosclerosis, mental stress and other health conditions.

Besides, compared with the sensor jointly released by JDI and the University of Tokyo in January 2020, the measurement method of this sensor has also changed. The old sensor is a transmissive type, that is, a Light-emitting Diode (LED) illuminates from above. Since it can only be mounted on a large-scale device, it has certain limitations. This sensor is reflective, that is, LEDs are installed next to the sensor, so it can be made thinner and suitable for wearable devices.

This sensor uses the same structure as the previous one, forming a TFT on polyimide resin, and then installing an organic photodetector on the TFT. Since the glass substrate is removed, it can be bent for use.

In February, Mr. Taku Nakamura, the head of the equipment R&D department of JDI, and Associate Professor Yokota Tomoyuki of the University of Tokyo won the "Japan OpenInnovaTIon Award"-the Minister of Science and Technology Policy Award from the Japanese Cabinet in February. The development of the thin image sensor has also been assisted by the Japan Science and Technology Agency (JST).

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